How to intentify interest?

Explain PCR. How it helps in amplification of gene of interest?

If is known that, if the interest i s compounded continuously, the principal changes f the rate equal to the product of the rate of bak interest per annum, and the principal. If the interest is compounded continuously at 5% per annum, in how many years will Rs. 100 double itself? At what interest rate will Rs. 100 double itself in 10 years ((log)_e2=0. 6931) How much will Rs. 1000 be worth at 5% interest after 10 years? (e^(0. 5)=1. 648)dot

The simple interest at 10% p.a. on a deposit for 2 years is Rs 4,000. If the interest in compounded on an annual basis, how much more will be the amount of interest ?

If date of drawings of the partner's is not given in the question, interest is charged for how much time

If a deposit of Rs 2,000 earns an interest of Rs 500 in 3 years, how much interest would a deposit of Rs 36,000 earn in 3 years with the same rate of simple interest?

A sum of Rs. 2400 amounts to Rs 3350 in 4 years at simple interest. If the ratio of interest in increased by 1% it would amount to how much ?

A sum of Rs800 amounts to Rs920 in 3 years at simple interest.If the interest rate is increased by 3%, it would amount to how much?

A certain sum triples in 4 years at compound interest, interest being compounded annually. In how many years would it become 27 times itself ?